Question

Supercharging is the process of
A.Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere.
B.Providing forced cooling air
C.Injecting excess fuel for raising more load
D.Supplying compressed air to remove combustion products fully

Answer 1

A supercharger is like an air compressor, it increases the amount of pressure of air supplied to an internal combustion engine.
This provides every intake cycle of the engine more oxygen, allows it to burn more fuel and do more work, thus increasing power.
Power for the supercharger can be given by mechanically means of a belt, gear, shaft, or chain connected to the engine's crankshaft.

Complete answer:
Supercharging is increasing an engine horsepower by a device called a supercharger. It has an impeller that will inject more air into the engine. But the limitation of this is that the impeller gets power from the engine output.
The output of the shaft engine is connected to the impeller. Finally, there should be some mechanical energy loss. They are expensive compared to turbochargers.
Turbocharging is the process that improves the engine horsepower by a device called a turbocharger. Similar to a supercharger, a turbocharger has an impeller. Since the impeller gets its power from the scavenging, it doesn't have any power loss. Scavenging is the process that removes exhaust gas from the engine.
In supercharging the intake air density is more than the density of the surroundings so every intake gets more oxygen and it burns more fuel and generates more power.

Finally, Option (A) is the correct answer.

Note:
Generally, Supercharging is used in the ic engine to increase the volume efficiency.
The petrol engines are commonly used for supercharging.
The supercharger increases the inlet air pressure and acts as a compressor.